Hacksaw blade clamp



J. H. ZAMENACK HACKSAW BLADE CLAMP March 29, 1960 Filed Aug. 5, 1958 2 Sheets-Sheet 1 John H. Zamenack INVENTOR.

9 BY w March 29, 1960 J. H. ZAMENACK 2,930,421

HACKsAw BLADE CLAMP Filed Aug. 5, 1958 2 Sheets-Sheet 2 Ilil ' IA I John H. Zamepack R I INVENTOR.

Un tedf t t s Pa e ffO 2,930,421. HACKSAW BLADE CLAMP John H. Zamenack, Oroville, Calif.

Application August 5, 1958, Serial No. 753,224 Claims. Cl. 145-35 Each end of this spiral type hacksaw blade is provided with a loop for attachment to the usual pins on, a conventional hacksaw frame. This loop construction engages the pins and by adjustment of the length between the pins in the usual manner, the spiral hacksaw blade is mounted for use and will cut regardless In many in-.

of the direction in which it is moved. stances. it is desired to cut into a piece of material such as Wood or-metal, a particular shape and size opening. There have been provided many specilized tools including keyhole saws, coping saws and the like but all of these devices will cut in only onedirection and require an expenditure of a relatively large sum of money for purchase thereof. Therefore, it is the primary object of the present invention to provide a clamp for one end of a spiral type hacksaw blade from which the loop at that end has been broken off and the blade inserted into a very small hole drilled into the object in which an aperture is to be formed. A further object is to provide in such a clamp means for engaging the pin in the hacksaw frame so that the hacksaw blade may be mounted" in the hacksaw frame in the usual manner after the blade is inserted through the small opening formed in the object for manipulation of the hacksaw blade in the desired manner to form the aperture, all for the purpose of eliminating the necessity of purchasing spe cial tools for forming a particular shape and size aperture in a piece of wood, metal or the like.

Another object of the present invention is to provide a hacksaw blade clamp which is extremely simple to manipulate,.effective and positive in its gripping action, easy to assemble and well adapted for its intended puroses.

p These. together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully here inafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure l is a side elevational view of a hacksaw frame and blade with the blade clamp of the present invention installed thereon;

Figure 2 is a side elevation of the blade clamp;

Figure 3 is a plan view of the blade clamp;

Figure 4 is an exploded elevational view of the blade clamp;

Figure 5 is a vertical sectional view taken substantially upon a plane passing along section line 5-5 of Figure 2 illustrating the construction of the blade clamp;

Figure 6 is a sectional view taken substantially upon ure 7 with the clamping member removed and with the bolt broken off;

Figure 9 is a vertical sectional view taken substantially upon a plane passing along section line 9-9 of Figure 7; and

Figure 10 is a perspective View of the clamping member per se.

Referring now specifically to the drawings, the numeral 10. generally designates the end clamp for a spiral type hacksaw blade 12 havingv the usual loop 14 rigid and integral with the other end thereof. The hacksaw blade 12 is mounted in the usual hacksaw frame generally designated by the numeral 16 and including an adjustable back'18 and parallel end members 20 and 22 with each of the end members 20 and 22 including a fitting 24 receiving a polygonal member 26 having an inclined pin 28 thereon for engagement with the pin of the hacksaw blade 12. A handle 30 is provided on one of the members 26 and the other member 26 is provided with a threaded extension 32 with a Wing nut 34 thereon whereby the hacksaw blade 12 may be mounted in tension between the pins 28 on the polygonal members 26 which are non-rotatably received within thesleeves 24. All of the construction hereinbefore described is of conventional nature with the present invention being confined to the particular construction of the end clamp for the blade and its association and relationship to the blade and to the hacksaw frame. a

v Referring now specifically to Figures 2-6, the blade clamp 10 includes a generally flat body 36 having an upwardly extending flange 38 along one side edge thereof and a depending U-shaped channel member 40 along the other edge thereof with the free edge 42 of the channel shaped member 40 being generally in the same horizontal plane as the free edge of the flange 38. Projecting longitudinally from one end of the member 36 is a mounting plate 44 having an aperture 46 therein for reception over the inclined pin 28 similar to the manner in which the loop 14 engages the other pin 28. The channel shaped member 40 is provided with a smoothly curved or generally semi-cylindrical interior surface for receiving therein the hacksaw blade 12 and generally engaging substantially one-half of the periphery thereof.

Overlying the member 36 is a generally fiat plate-like clamp member 48 having one side edge thereof extending perpendicularly into a vertical leg as indicated by the numeral 50 which is received in the channel shaped member 40 and which engages with its lower edge the hacksaw blade 12 for clampingly engaging the hacksaw blade 12 and frictionally retaining the clamp on the hacksaw blade. p i I The channel shaped member 40 is provided with an I aperture 52 adjacent the mounting plate 44 and the de pending leg 50 of the clamp plate 48 is provided with a downwardly projecting lug 54 which extends through the aperture 52 which aligns the clamp plate 48 with the member 36 and also forms a limit for insertion of the hacksaw blade 12 so that the teeth on the blade will not be engaged by the clamp member 48 thus assuring a positive grip with the hacksaw'blade.

A J-bolt 56 has a threaded shank 58 extending through the flat member 36 and the flat clamping plate 58 with the curved portion 60 extending under and receiving the surface of the channel shaped member 40. The threaded shank 58 receives a wing nut 62 whereby tightening of the wing nut 62 will cause the clamping leg 50 to be jammed against the top surface of the hacksaw blade 12 thus rigidly clamping the end clamp 10 to the hacksaw blade 12 so that the aperture 46 may be positioned over the pin 48 for mounting the blade 12 in the hacksaw in the usual manner. In use, a small hole such as a one-sixteenth hole may be bored into the piece of work material which hole can be made with a readily available hand drill or small electric drill after which the conventional loop on one end of the hacksaw blade is broken off and the hacksaw blade inserted through the small hole and the end clamp 10 afiixed thereto with the hacksaw framethen being mounted on the blade in the usual manner for manipulation of the blade in any direction for cutting out any size and shape aperture or hole as desired in the object. 7

Referring now specifically to Figures 71(), the numeral 70 designates a modified form of the end blade clamp of the present invention which includes a generally U-shaped or channel shaped body member 72 receiving the hacksaw blade 74 in the bight portion thereof with the bight portion also having an aperture 76 with the member 72 having integral therewith a mounting plate 78 having a pin receiving aperture 80 for mounting over the pin 28 in the hacksaw blade frame.

A clamp plate in the form of a vertical plate 82 is received between the legs of the U-shaped member and is provided with a depending leg 84 in one end thereof for sliding engagement through the opening 86 and a small notch 86 is provided at the juncture of the lower edge of the clamp plate 82 and the depending lug 84.

For holding the clamp plate 82 in the member 72 in clamping engagement with the hacksaw blade 74, there is provided a threaded bolt 88 having an enlarged eye member 99 integral Lherewith which receives the U-shaped member 72 therein. The bolt 88 is also provided with a slot 92 which slidably receives the plate 82 with a wing nut 94 being provided thereon for engaging the upper edge of the clamp plate 82 and urging the same downwardly against the hacksaw blade 74.

The free ends of the legs of the U-shaped member 72 are each provided with a longitudinal extension 96 which is bent rearwardly alongside and against the outer surface of the legs of the U-shaped member 72 and are bent over the edges or side portions of the eye 90 of the bolt 88 with this portion of the extensions being designated by the numeral 98 and clearly shown in Figure 8. The extensions are of less cross-sectional or vertical height than the legs of the U-shaped member 72 but serve to hold in position the eye 90 of the bolt 88 so that the clamping plate 82 may be more expeditiously manipulated so that the end clamp 70 may be readily attached to the hacksaw blade 74.

The operation of this form of the inventoin is exactly that same as that previously set forth in that the device is especially useful in attachment to the hacksaw blade after the conventional loop of the spiral hacksaw blade has been removed so that the hacksaw blade may be inserted through a very small opening with subsequent pressure being exerted on the blade in any direction for the formation of any size and shape hole in the particular object.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A blade clamp for a spiral hacksaw blade comprising a generally channel-shaped member having a projecting bracket on one end thereof, said bracket having an aperture for receiving a pin on a hacksaw frame, said channel-shaped member receiving the hacksaw blade therein, a clamp plate received in said channel shaped member and engaging the top surface of said hacksaw blade, and a clamp bolt engaging both the channel-shaped member and the clamp plate and straddling the channel shaped member for lockingly urging the clamp plate into engagement with the hacksaw blade.

2. The combination of claim 1 wherein said channel-shaped member includes a laterally extending flat plate, said clamp plate including a flat plate overlying the fiat plate on the channel-shaped member with the clamp plate including a depending leg, said clamp bolt including a J-bolt engaged under the channel-shaped member and extending through the flat plate for urging the same together.

3. The combination of claim 1 wherein said clamp bolt includes an eye portion receiving the channel-shaped member, said clamping plate being in the form a of vertical plate received between the legs of the channelshaped member, and a pair of extensions on the legs of the channel-shaped member reversely folded alongside the outer surface of the legs of the channel-shaped memher and curved over the side portions of the eye bolt thus retaining the bolt in position.

4. The combination of claim 3 wherein the bight portion of the channel-shaped member is provided with an aperture, said vertical clamping plate including a depending lug receivable in said aperture for defining a stop limit for insertion of the hacksaw blade.

5. The combination of claim 1 wherein said clamp plate has an edge engaging the top surface of the hacksaw blade and is provided with a depending lug at said edge, said channel-shaped member having an aperture therein for receiving said lug with the lug being disposed for engagement by the end of the hacksaw blade for limiting the insertion of the hacksaw blade.

References Cited in the file of this patent UNITED STATES PATENTS 1,043,405 Dagenais Nov. 5, 1912 1,474,210 Royle Nov. 13, 1923 1,493,931 Gasstrom May 13, 1924 2,520,145 Horton Aug. 29, 1950 FOREIGN PATENTS 402,370 Germany Sept. 18, 1924 

